linux-kernel - Re: [patch 3/3]use new macros for x86 percpu readmostly section

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Message-Id: <20101209143201.6ab0a49d.akpm@linux-foundation.org>
Date:	Thu, 9 Dec 2010 14:32:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"hpa@...or.com" <hpa@...or.com>, sam@...nborg.org,
	eric.dumazet@...il.com, linux-arch@...r.kernel.org
Subject: Re: [patch 3/3]use new macros for x86 percpu readmostly section

On Thu, 02 Dec 2010 10:02:30 +0800
Shaohua Li <shaohua.li@...el.com> wrote:

> Use the new macros to correctly align percpu readmostly data.
> 
> Signed-off-by: Shaohua Li <shaohua.li@...el.com>
> ---
>  arch/x86/kernel/vmlinux.lds.S |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> Index: linux/arch/x86/kernel/vmlinux.lds.S
> ===================================================================
> --- linux.orig/arch/x86/kernel/vmlinux.lds.S	2010-12-02 09:48:44.000000000 +0800
> +++ linux/arch/x86/kernel/vmlinux.lds.S	2010-12-02 09:54:24.000000000 +0800
> @@ -226,7 +226,7 @@ SECTIONS
>  	 * output PHDR, so the next output section - .init.text - should
>  	 * start another segment - init.
>  	 */
> -	PERCPU_VADDR(0, :percpu)
> +	PERCPU_VADDR_CACHEALIGNED(0, :percpu, INTERNODE_CACHE_BYTES)
>  #endif
>  
>  	INIT_TEXT_SECTION(PAGE_SIZE)
> @@ -301,7 +301,7 @@ SECTIONS
>  	}
>  
>  #if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
> -	PERCPU(THREAD_SIZE)
> +	PERCPU_CACHEALIGNED(THREAD_SIZE, INTERNODE_CACHE_BYTES)
>  #endif
>  
>  	. = ALIGN(PAGE_SIZE);
> 

So what is the situation now with all other architectures?  Should they
be changed to correctly align their read-mostly percpu areas?

If so, what should the arch maintainers do to achieve this?
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